GNS3 is a graphical network simulator that allows simulation of complex networks. GNS3 is an excellent complementary tool to real labs for network engineers administrators and people wanting to pass certifications such as CCNA CCNP CCIP CCIE JNCIA JNCIS JNCIE. It can also be used to experiment features of Cisco IOS Juniper JunOS or to check configurations that need to be deployed later on real routers.

To allow complete simulations GNS3 is strongly linked with :
* Dynamips the core program that allows Cisco IOS emulation.
* Dynagen a text-based front-end for Dynamips.
* Qemu a generic and open source machine emulator and virtualizer.

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